Correct form validation if file inputs are cancelled.

Author: costas80

pom.xml

@@ -26,7 +26,7 @@
     <parent>
         <groupId>eu.europa.ec.itb.commons</groupId>
         <artifactId>validator-parent</artifactId>
-        <version>1.10.0</version>
+        <version>1.11.0-SNAPSHOT</version>
         <relativePath/>
     </parent>
     <modules>